/Engine/Plugins/Runtime/MassGameplay/Source/MassSpawner/Public/MassSpawner.h
Any EntitiesToIgnore previously spawned by this spawner will remain spawned and tracked by this spawner.
void DoDespawning ( TConstArrayView< [FMassEntityHandle](API\Plugins\MassEntity\FMassEntityHandle) > EntitiesToIgnore )